/*
 * Copyright ©2017, RockScript.io. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.rockscript.engine.impl;

import io.rockscript.service.*;
import io.rockscript.Engine;

import java.util.List;

public class SystemImportServiceFunction implements ServiceFunction {

  transient Engine engine;

  public SystemImportServiceFunction(Engine engine) {
    this.engine = engine;
  }

  @Override
  public String getFunctionName() {
    return "import";
  }

  @Override
  public String getServiceName() {
    return "system";
  }

  @Override
  public List<String> getArgNames() {
    return null;
  }

  @Override
  public ServiceFunctionOutput invoke(ServiceFunctionInput input) {
    String url = (String) input.getArgs().get(0);
    Object importedObject = engine.getImportResolver().get(url);
    return ServiceFunctionOutput.endFunction(importedObject);
  }

  @Override
  public String toString() {
    return "[system.import serviceFunction]";
  }
}
